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Re: before I left US,I did call at&t for international ca...
If you have checked that your phone is is the correct hardware for accessing the network (as the reply above suggests) its still possible to have problems connecting to a foreign network, even if your account is properly provisioned to do so. I had that problem when travelling to Japan recently. I called customer support (+1-916-843-4685 form overseas), and they were able to sort it out. Apparently, my account did have International Roaming activated, but there were some "daughter codes" (whatever that means) missing on their system. He was able to fix it right up in just a couple minutes.
Call the 916 customer service number and they should be able to set you straight.